2G what would be the difference....

[my1st2genGSX]

....other than the word "high pressure" and $10 less between these pumps? I am looking at the Walbro 255lph.

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[A Sharp]

The HPs are intended for boosted applications. They flow better at higher pressures.

http://www.dsmtuners.com/threads/injector-and-fuel-pump-supported-airflow.366003/

 

[my1st2genGSX]

Ok. So that is what I'm gonna get...thanks

 

[Vegas Smith]

You might look into getting the 450. As far as I'm aware, there isn't any downside. However, with the 2gs you may have to mess around with some stuff.

 

[my1st2genGSX]

You might look into getting the 450. As far as I'm aware, there isn't any downside. However, with the 2gs you may have to mess around with some stuff.

I know you've been in this awhile...what kind of stuff would I have to do?

 

[Jacolu3]

For the 450 you would have to drill the siphon to 1/8".
If you search there is a thread on it with pictures. Very easy

 

[my1st2genGSX]

So lets say I wanted to go e85, would that one work? And I would have to go 1250cc injectors...

 

[jakk220]

So lets say I wanted to go e85, would that one work? And I would have to go 1250cc injectors...

Depends on your power goals. The 450 is perfect for E85. I ran my 255lph on E85 and it did alright at 27psi with my FP green. I was about out of pump though. The proper way to install the 450 is to remove the factory feed tube on the sending unit by drilling it out and adding a bulkhead fitting with a barb and submersible fuel hose with clamps going to the pump. I couldn't get mine to work properly without doing that. I tried everything from the toyota seal to the factory o-ring. The OEM way that the pump seals is junk.

You will need to drill out the siphon as stated above. It is super easy and takes no time at all. 1/8th is the size you want to use. Any bigger and you will mess up the venturi flow. Once I did my -8AN feed line and installed the 450 the proper way I had fuel pressure that I couldn't get below 60psi at idle. Drilled out the siphon to 1/8th and that fixed it. The 450 is an amazing pump in my opinion. You just have to do a little extra to get it to work properly.